183 
Key and landed at three points on Elliott’s Key ; also on Caesar's 
Rock, a small island on Caesar's Creek; time prevented our 
going further south. The rock of Sand’s Key and of Elliott's 
Key differs from that of the mainland in that it is the practically 
unaltered coral reef, elevated slightly above high water, while 
that of the mainland south of Miami is a coral-rock sandstone 
formed by the comminution of the original reefs and the redep- 
osition of the detritus and its sorting and stratification by wind 
Fic. 21. The solitary remaining individual of Sargent’s Palm (Pseudophoenix 
Sargentit ), on Elliott’s Key, Florida. 
and water. This soil difference causes a considerable difference 
in the vegetatio 
Several ne were given to the care and packing of the col- 
lections and to local exploration about Miami, including an exami- 
nation of the banks of the Miami River up to its rapids where it 
leaves the everglades a few miles west of the town ; at this point 
